David’s shepherd work prepared him for personal combat with a giant.
When we ask what it takes to be an elder, we should not forget Acts 20:28-31. According to Paul, the shepherd does not merely keep an eye out each day to take care of the sheep; he also keeps an eye out each night to take care of the wolves. And by taking care of those, I am thinking of how David took care of the lions and bears in 1 Samuel 17:36.
I’m not seeing the connection. Paul seems to be talking about spiritual warfare (protecting the Church from false teaching, etc), while David was talking about physical engagements. Are you saying elders should be physically capable of taking out bears & lions?